C11112331333132311331333131333133313231333132212113313232233121   >>    C1111233133313231133133313133313331323133313221211331323223312   <<    C11112331333132311331333131333133313231333132212113313232233123   >>      C11112331333132311331333131333133313231333132212113313232233122   >>